A series of clever advertisements have been popping up around Toronto urging visitors and residents to keep from littering. The ads, by the City of Toronto's Livegreen organization, arrange pieces of trash found on the ground so that their labels spell...

Many people complain about advertisements as an obnoxious way for companies to invade our everyday lives and cram their products down our throats, but that's not all that advertisements are good for. The advertisements on this list are excellent examples of...